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Here's what the a portion of the wall looks like. The full depth basement walls are the same material.

Thanks for the information as two heads are better than one! I thought about your point about having a good bond between the old wall and any extension wall placed below as this will be the weakest area in regards to resisting any pressure placed on the outside wall by exterior soil. I...

Here is a breakdown of the basement which uses the same 18" deep limestone walls. We've replaced the floor in the full basement area with a new 6" slab. The root cellar has perhaps 1 or 2" of old cement. The crawl space has no floor as is hardened soil - its black soil but you need a pick to...

Thank for your input. When we built our attached 24' x 36' garage plus a small bump-out to contain a new basement entrance connecting the basement to the garage via hallway closed off by doors we used a 16" x 8" footer with just over 4 foot foundation walls under the main 6" floor slabs...

Yes that is correct. Each 20" x 18" x 48" limestone wall section weighs 1,504 pounds based upon the cubic weight of limestone. I'd round it up to 2,000 to be on the safe side. The mock-up of the jack was not intended as a actual plan of anything to be built but just to illustrate the...

The illustration is just a quick mock-up of of how a jack would need to be positioned and not anything I've actually built. The actual jack would need a lot of extra support such as more extensive frame connected, a wider support base, and some type of counterweight. A 20" x 16" x 48" section...

Here's a better illustration of what we are looking for in terms of a jack. 1. Remove a 20" wide top portion of the cement over the dirt to expose the bottom of the limestone wall. 2. Drill one or two holes in the dirt under the bottom of the wall. 3. Insert horizontal jack arms in the hole...

We live in an area whereas the base ground layer under any dirt is limestone. Older houses are built with pieces of limestone taken from the ground and roughly shaped into rectangles and square of various sizes which are then joined together with mortar. This is not the finely polished blocks...

One half of the house sits on 18" thick limestone foundation that is full height. The other half is of the same construction wall, but extends just over 4 feet to be below the frost line. The existing wall is massive, solid, and has never leaked unlike many modern walls which use hollow blocks...

About half of our basement sets on a 16" wide shaped limestone wall held together with mortar from the 1870s. It extends just over 4 feet and sits on undistributed compacted dirt. We are wanting to underpin the wall in this area of the basement to achieve full 8' foot tall walls by digging the...